Patent GB-654694-A (GB)
Title: Process for converting hydrocarbon distillates into gasoline of high anti-knock value
Inventor: WHITE JOHN BENJAMIN
Filed: 1948-04-19
Abstract: <PICT:0654694/IV (b)/1> The anti-knock value of a gasoline is increased by subjecting it to reforming in a heating coil at temperatures of from 540 DEG  to 565 DEG  C., and pressures of from 40 to 55 atmospheres, lowering the pressure on the effluent to between 10 and 16 atmospheres, adding a cooling oil at between 155 DEG  and 285 DEG  C., to the coil effluent so that the mixture has a temperature between 350 DEG  and 390 DEG  C., fractionating the mixture into a gas fraction, the improved gasoline, a residual oil fraction, and an oil fraction which is cooled and which, at the temperature between 155 DEG  and 285 DEG  C., is used for admixture with the effluent.  The admixture of gasoline from the heating coil 6, and cooling oil entering through line 50 before, or line 48 after, the reducing valve 8, is fractionated in a flash fractionating column 10 at a pressure from 10 to 16 atmospheres.  The vapours therefrom (which may be given a clay purification treatment) are passed through preheater 4 and condenser 12 to accumulator 13 and receiver 18 and thence to stabilizer 56, from which the desired gasoline is drawn through line 64, reboiler 65 and line 67.  The gases from the stabilizer drawn off through line 61 may be subjected to catalytic polymerization.  A side stream may be taken through line 40 and cooled by passage through line 44, through the stabilizer reboiler 65-where it supplies heat and is thereby cooled to 155 DEG  to 250 DEG  C.-and thence through line 45 to be used as cooling oil.  The residue from column 10 may be passed through line 44 to serve entirely, or in part, as cooling oil, or it may first be stripped in stripper 23 at not more than 2 atmospheres, the residue passing to storage and the vapours passing to condenser 25 and the condensate from receiver 26 at a temperature of about 35 DEG  to 45 DEG  C., passing through line 29 to mix with the other cooling oil in line 45. Specification 506,849, [Group III], is referred to.ALSO:The anti-knock value of a gasoline is increased by subjecting it to reforming in a heating coil at temperatures of from 540 DEG  to 565 DEG  C., and pressures of from 50 to 55 atmospheres, lowering the pressure on the effluent to between 10 <PICT:0654694/III/1> and 16 atmospheres, adding a cooling oil at between 155 DEG  and 285 DEG C., to the coil effluent so that the mixture has a temperature between 350 DEG  and 390 DEG  C., fractionating the mixture into a gas fraction, the improved gasoline, a residual oil fraction and an oil fraction which is cooled and which, at the temperature between 155 DEG  and 285 DEG  C., is used for admixture with the effluent. The admixture of gasoline from the heating coil 6, and cooling oil entering through line 50 before, or line 48 after, the reducing valve 8, is fractionated in a flash fractionating column 10 at a pressure from 10 to 16 atmospheres.  The vapours therefrom (which may be given a clay purification treatment) are passed through preheater 4 and condenser 12 to accumulator 13 and receiver 18 and thence to stabilizer 56, from which the desired gasoline is drawn through line 64, reboiler 65 and line 67.  The gases from the stabilizer drawn off through line 61 may be subjected to catalytic polymerization.  A side stream may be taken through line 40 and cooled by passage through line 44, through the stabilizer reboiler 65-where it supplies heat and is thereby cooled to 155 DEG  to 250 DEG  C.-and thence through line 45 to be used as cooling oil.  The residue from column 10 may be passed through line 44 to serve entirely, or in part, as cooling oil, or it may first be stripped in stripper 23 at not more than 2 atmospheres, the residue passing to storage and the vapours passing to condenser 25 and the condensate from receiver 26 at a temperature of about 35 DEG  to 45 DEG  C., passing through line 29 to mix with the other cooling oil in line 45.  Specification 506,849 is referred to.